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The effect of calcination temperature on metakaolin structure for the synthesis of zeolites

Published online by Cambridge University Press:  29 January 2019

Magdalena Król  and
Piotr Rożek
Magdalena Król*
Affiliation:
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
Piotr Rożek
Affiliation:
Faculty of Materials Science and Ceramics, AGH University of Science and Technology, 30 Mickiewicza Av., 30-059 Krakow, Poland
*
*E-mail: mkrol@agh.edu.pl
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Abstract

The aim of this research was to determine the temperature of kaolin calcination in order to obtain an intermediate product (metakaolin) for the synthesis of geopolymers with potential application as self-supporting zeolitic membranes. The products obtained were analysed with X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). The structural analysis of the metakaolins obtained suggested that the optimal temperature for the proposed application is 700°C. After alkali activation of metakaolin, it is possible to obtain zeolite A and hydroxysodalite. The factors analysed, determining the type and quantity of crystalline phases, were activation temperature and concentration of sodium hydroxide solution (activator). The largest amounts of zeolites were obtained by alkali activation with 9 mol/dm3 NaOH solution at 70°C.

Keywords

kaolinmetakaolincalcinationalkali activationgeopolymerself-supported membranezeolite A
Type
Article
Information
Clay Minerals , Volume 53 , Issue 4 , December 2018 , pp. 657 - 663
Copyright
Copyright © Mineralogical Society of Great Britain and Ireland 2018 

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Footnotes

Associate Editor: J. Labrincha

References

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